Handle inclusion of port modules 'correctly', viz the same way libpq does it.  Fixes OS X, which needs path.c.  It may be that Win32 needs some more port modules, but they are easily added.
Handle inclusion of port modules 'correctly', viz the same way libpq
does it.  Fixes OS X, which needs path.c.  It may be that Win32 needs
some more port modules, but they are easily added.

tangp3/gpdb,janebeckman/gpdb,oberstet/postgres-xl,yazun/postgres-xl,ahachete/gpdb,jmcatamney/gpdb,xuegang/gpdb,randomtask1155/gpdb,rvs/gpdb,CraigHarris/gpdb,xuegang/gpdb,CraigHarris/gpdb,50wu/gpdb,zaksoup/gpdb,foyzur/gpdb,tangp3/gpdb,techdragon/Postgres-XL,Chibin/gpdb,zaksoup/gpdb,adam8157/gpdb,foyzur/gpdb,techdragon/Postgres-XL,adam8157/gpdb,xuegang/gpdb,ovr/postgres-xl,Chibin/gpdb,cjcjameson/gpdb,Postgres-XL/Postgres-XL,foyzur/gpdb,tangp3/gpdb,adam8157/gpdb,kaknikhil/gpdb,lisakowen/gpdb,greenplum-db/gpdb,janebeckman/gpdb,zeroae/postgres-xl,ashwinstar/gpdb,tangp3/gpdb,techdragon/Postgres-XL,0x0FFF/gpdb,kaknikhil/gpdb,postmind-net/postgres-xl,zeroae/postgres-xl,edespino/gpdb,jmcatamney/gpdb,snaga/postgres-xl,postmind-net/postgres-xl,Postgres-XL/Postgres-XL,lintzc/gpdb,50wu/gpdb,xinzweb/gpdb,pavanvd/postgres-xl,lintzc/gpdb,jmcatamney/gpdb,randomtask1155/gpdb,adam8157/gpdb,lpetrov-pivotal/gpdb,chrishajas/gpdb,Postgres-XL/Postgres-XL,lintzc/gpdb,rvs/gpdb,cjcjameson/gpdb,janebeckman/gpdb,lintzc/gpdb,ahachete/gpdb,jmcatamney/gpdb,yuanzhao/gpdb,arcivanov/postgres-xl,randomtask1155/gpdb,ovr/postgres-xl,Chibin/gpdb,pavanvd/postgres-xl,oberstet/postgres-xl,yazun/postgres-xl,0x0FFF/gpdb,ahachete/gpdb,ahachete/gpdb,adam8157/gpdb,kmjungersen/PostgresXL,Quikling/gpdb,CraigHarris/gpdb,randomtask1155/gpdb,foyzur/gpdb,yuanzhao/gpdb,tpostgres-projects/tPostgres,arcivanov/postgres-xl,CraigHarris/gpdb,lpetrov-pivotal/gpdb,tangp3/gpdb,jmcatamney/gpdb,royc1/gpdb,50wu/gpdb,greenplum-db/gpdb,adam8157/gpdb,royc1/gpdb,royc1/gpdb,rvs/gpdb,Quikling/gpdb,lpetrov-pivotal/gpdb,ashwinstar/gpdb,yazun/postgres-xl,CraigHarris/gpdb,edespino/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,janebeckman/gpdb,zaksoup/gpdb,edespino/gpdb,foyzur/gpdb,jmcatamney/gpdb,Quikling/gpdb,atris/gpdb,randomtask1155/gpdb,adam8157/gpdb,royc1/gpdb,rubikloud/gpdb,Chibin/gpdb,greenplum-db/gpdb,rubikloud/gpdb,xinzweb/gpdb,lisakowen/gpdb,zaksoup/gpdb,zaksoup/gpdb,kaknikhil/gpdb,oberstet/postgres-xl,randomtask1155/gpdb,rubikloud/gpdb,zeroae/postgres-xl,rubikloud/gpdb,yuanzhao/gpdb,yazun/postgres-xl,0x0FFF/gpdb,kaknikhil/gpdb,0x0FFF/gpdb,chrishajas/gpdb,lpetrov-pivotal/gpdb,cjcjameson/gpdb,xinzweb/gpdb,pavanvd/postgres-xl,ahachete/gpdb,Quikling/gpdb,techdragon/Postgres-XL,yuanzhao/gpdb,CraigHarris/gpdb,snaga/postgres-xl,atris/gpdb,rubikloud/gpdb,rvs/gpdb,snaga/postgres-xl,tangp3/gpdb,tangp3/gpdb,lintzc/gpdb,kmjungersen/PostgresXL,atris/gpdb,cjcjameson/gpdb,zeroae/postgres-xl,rvs/gpdb,lpetrov-pivotal/gpdb,kaknikhil/gpdb,lisakowen/gpdb,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,atris/gpdb,janebeckman/gpdb,lpetrov-pivotal/gpdb,0x0FFF/gpdb,rvs/gpdb,cjcjameson/gpdb,ahachete/gpdb,edespino/gpdb,royc1/gpdb,yazun/postgres-xl,yuanzhao/gpdb,janebeckman/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,chrishajas/gpdb,adam8157/gpdb,CraigHarris/gpdb,atris/gpdb,50wu/gpdb,lpetrov-pivotal/gpdb,pavanvd/postgres-xl,snaga/postgres-xl,xinzweb/gpdb,Quikling/gpdb,foyzur/gpdb,tangp3/gpdb,edespino/gpdb,arcivanov/postgres-xl,yuanzhao/gpdb,lisakowen/gpdb,ovr/postgres-xl,lisakowen/gpdb,xinzweb/gpdb,kaknikhil/gpdb,atris/gpdb,Quikling/gpdb,lintzc/gpdb,ashwinstar/gpdb,lpetrov-pivotal/gpdb,Quikling/gpdb,edespino/gpdb,xuegang/gpdb,lintzc/gpdb,xuegang/gpdb,kmjungersen/PostgresXL,arcivanov/postgres-xl,Postgres-XL/Postgres-XL,ahachete/gpdb,cjcjameson/gpdb,rvs/gpdb,50wu/gpdb,Postgres-XL/Postgres-XL,tpostgres-projects/tPostgres,atris/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,rvs/gpdb,xinzweb/gpdb,royc1/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,Chibin/gpdb,yuanzhao/gpdb,tpostgres-projects/tPostgres,xuegang/gpdb,edespino/gpdb,pavanvd/postgres-xl,oberstet/postgres-xl,royc1/gpdb,chrishajas/gpdb,edespino/gpdb,yuanzhao/gpdb,50wu/gpdb,foyzur/gpdb,techdragon/Postgres-XL,Quikling/gpdb,randomtask1155/gpdb,xinzweb/gpdb,0x0FFF/gpdb,zeroae/postgres-xl,kaknikhil/gpdb,janebeckman/gpdb,lintzc/gpdb,Chibin/gpdb,kmjungersen/PostgresXL,rvs/gpdb,jmcatamney/gpdb,foyzur/gpdb,janebeckman/gpdb,Quikling/gpdb,Chibin/gpdb,xuegang/gpdb,oberstet/postgres-xl,jmcatamney/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,0x0FFF/gpdb,Chibin/gpdb,chrishajas/gpdb,xinzweb/gpdb,postmind-net/postgres-xl,atris/gpdb,xuegang/gpdb,arcivanov/postgres-xl,postmind-net/postgres-xl,50wu/gpdb,Chibin/gpdb,greenplum-db/gpdb,snaga/postgres-xl,xuegang/gpdb,zaksoup/gpdb,ovr/postgres-xl,greenplum-db/gpdb,randomtask1155/gpdb,chrishajas/gpdb,lintzc/gpdb,yuanzhao/gpdb,edespino/gpdb,cjcjameson/gpdb,chrishajas/gpdb,edespino/gpdb,greenplum-db/gpdb,rvs/gpdb,arcivanov/postgres-xl,chrishajas/gpdb,50wu/gpdb,ovr/postgres-xl,lisakowen/gpdb,postmind-net/postgres-xl,kmjungersen/PostgresXL,Quikling/gpdb,0x0FFF/gpdb,CraigHarris/gpdb,Chibin/gpdb,janebeckman/gpdb,ashwinstar/gpdb,lisakowen/gpdb,CraigHarris/gpdb,ahachete/gpdb,royc1/gpdb,janebeckman/gpdb,rubikloud/gpdb,rubikloud/gpdb,rubikloud/gpdb,zaksoup/gpdb,zaksoup/gpdb,lisakowen/gpdb